Below is a list of the most important tax dates to keep in mind this tax season through the end 2015.

Individual taxpayers

• January 5, 2015: TurboTax starts accepting your tax return (if you are exiling, then they hold it and file for you on January 20).
• January 20, 2015: The IRS begins accepting eFiles.
• April 15, 2015
  • Deadlines for the following:
    • file individual tax returns – Form1040, 1040A, 1040EZ
    • file automatic 6 months extension – Form 4868
    • estimated tax payments for the 1st quarter
    • for 2011 tax year – last chance to file 1040 and receive a tax refund; last day to file 1040X Amended Tax returns for 2011; similarly, trusts and partnerships can file amended income tax for that year.
• June 15, 2015:
  • Deadlines for the following:
    • file individual tax returns for US citizens living abroad – Form 1040
    • file automatic 4 months extension – Form 4868
• October 15, 2015:
  • individual tax returns due after an extension received
  • Last day to file your taxes electronically, from that point on they have to be mailed

Corporations and non-profit organizations

• March 16, 2015
  • Corporate tax returns – Forms 1120, 1120A, 1120S
  • Automatic 6 months extension – Form 7004
  • File amended corporate tax return for 2011 and claim a refund – Form 1120X
• April 15, 2015
  • income tax return for estates and trusts – Form 1041
  • return of partnership income – Form 1065 and provide a Schedule K-1 to every partner
  • in both cases, if necessary, file automatic 5 months extension – Form 7004
• May 15, 2015
  • return of organization exempt from income tax – Form 990
  • Application for Extension of Time to File an Exempt Organization Return – Form 8868
• September 15, 2015
• file corporate tax returns after an extension was granted (6 months)
• partnership tax returns are due after an extension was granted (5 months)

Estimated Tax payments

• 4th quarter: January 15 – this is for the 4th quarter of 2014; not applicable if you file a return and pay balance by February 2, 2015.
• 1st quarter: April 15.
• 2nd quarter: June 15.
• 3rd quarter: September 15.